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Steve, the various propellor insignia identify OR's as you say. A similar system is still in use in the RAF where the two plades indicate Leading Aircraftman or LAC (PFC in US parlance I think) three is Senior Aircraftsman or SAC (equivalent to Lance Corporal) and four is JT or Junior Technician, which is as you say a grade.In the past a single inverted chevron would have been worn. You would , and still do, also see the four blades in combination with Sgts stripes on a Chief Technician.
HTH
Peter L
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cheers
Peter L
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